Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
A222684
Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
Terms
- a(0) =0a(1) =3a(2) =8a(3) =50a(4) =216a(5) =1120a(6) =5440a(7) =27576a(8) =138560a(9) =704880a(10) =3590400a(11) =18382208a(12) =94348800a(13) =485706240a(14) =2505943040a(15) =12956458880a(16) =67108497408a(17) =348156924160
External references
- oeis: A222684